微服务架构 | 服务注册发现中心 -[springcloud 整合 zookeeper]

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目录

• 依赖
• 配置
• 启动类
• 验证

依赖

        <!-- SpringBoot整合zookeeper客户端 -->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-zookeeper-discovery</artifactId>
            <!--排除后重新引入 zookeeper 的目的是保证版本和服务器上的版本一致-->
            <exclusions>
                <exclusion>
                    <groupId>org.apache.zookeeper</groupId>
                    <artifactId>zookeeper</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
        <!--项目引入的版本和服务器上不一致时，可能导致启动失败-->
        <dependency>
            <groupId>org.apache.zookeeper</groupId>
            <artifactId>zookeeper</artifactId>
            <version>3.4.9</version>
        </dependency>

配置

#8004表示注册到zookeeper服务器的支付服务提供者端口号
server:
  port: 8080

#服务别名----注册zookeeper到注册中心名称
spring:
  application:
    name: servicename
  cloud:
    zookeeper:
      connect-string: zookeeper地址

启动类

重点是 @EnableDiscoveryClient 注解，此注解通用与各种注册中心

@SpringBootApplication
@EnableDiscoveryClient
public class ZookeeperServiceApplication{
    public static void main(String[] args) {
        SpringApplication.run(ZookeeperServiceApplication.class,args);
    }
}

验证

简易安装 zookeeper 流程

1 下载包 https://zookeeper.apache.org/

2 解压缩

tar -zxvf apache-zookeeper-3.7.1-bin.tar.gz

3 增加环境变量

vim /etc/profile

# zookeeper 
export ZOOKEEPER_HOME=/opt/apache-zookeeper-3.7.1-bin
export PATH=$PATH:${ZOOKEEPER_HOME}/bin

source /etc/profile

4 改配置

vim /opt/apache-zookeeper-3.7.1-bin/conf/zoo.cfg

# 设置一个单位时间，其他时间的设置都是n倍的此时间
tickTime=2000

# 节点初始化时间，节点连接到主节点并完成同步的时间
initLimit=10

# 节点同步时间，主从节点通信的时间
syncLimit=5

# 数据/日志存放路径(zookeeper的核心是一个文件系统)
dataDir=/opt/zookeeper
dataLogDir=/opt/zookeeper/logs

# 客户端端口
clientPort=2181

# 客户端最大连接数
#maxClientCnxns=60

启动 zookeeper server

./zkServer.sh start
启动时，需要确认防火墙放行相关端口

查看状态

./zkServer.sh status

启动服务（springcloud）

查看服务注册状态
进入 zkClient 命令行

./zkCli.sh

ls -R /services

get /services/payment-service-zookeeper-1/a5fdd27b-ba88-4949-9ea7-78a18f1a498e

{
    "name":"payment-service-zookeeper-1",
    "id":"a5fdd27b-ba88-4949-9ea7-78a18f1a498e",
    "address":"MSI-DEUS",
    "port":8004,
    "sslPort":null,
    "payload":{
        "@class":"org.springframework.cloud.zookeeper.discovery.ZookeeperInstance",
        "id":"application-1",
        "name":"payment-service-zookeeper-1",
        "metadata":{

        }
    },
    "registrationTimeUTC":1657093753525,
    "serviceType":"DYNAMIC",
    "uriSpec":{
        "parts":[
            {
                "value":"scheme",
                "variable":true
            },
            {
                "value":"://",
                "variable":false
            },
            {
                "value":"address",
                "variable":true
            },
            {
                "value":":",
                "variable":false
            },
            {
                "value":"port",
                "variable":true
            }
        ]
    }
}

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